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12387279-42 — WASHER,FLAT

✓ Government record, cited
— · NUT WASHER
PRODUCT OVERVIEW

12387279-42: WASHER,FLAT.

The WASHER,FLAT is a the manufacturer industrial component. Key specifications include thickness: 0.036 INCHES MINIMUM AND 0.065 INCHES MAXIMUM IN, hole_diameter: 0.214 INCHES MINIMUM AND 0.224 INCHES MAXIMUM IN, overall_diameter: 0.495 INCHES MINIMUM AND 0.515 INCHES MAXIMUM IN, surface_treatment: ZINC AND CHROMATE OVERALL, peripheral_shape_style: ROUND, center_hole_shape_style: ROUND. This part is cataloged in the U.S.

Government catalog under NSN 5310-01-389-9681, indicating validated use in U.S. government and defense logistics supply chains. Available through authorized enterprise resellers and TPM (Third Party Maintenance) channels.

Verify compatibility with your specific system configuration before ordering.

WHERE IT FITS
12387279-42
NSN: 5310-01-389-9681
FSC: 5310 — Nuts and Washers
CAGE: 19207 — U S ARMY TANK AUTOMOTIVE COMMAND AMSTA-IM-MM (USA)
SPECIFICATIONS
thickness0.036 INCHES MINIMUM AND 0.065 INCHES MAXIMUM IN
hole_diameter0.214 INCHES MINIMUM AND 0.224 INCHES MAXIMUM IN
overall_diameter0.495 INCHES MINIMUM AND 0.515 INCHES MAXIMUM IN
surface_treatmentZINC AND CHROMATE OVERALL
peripheral_shape_styleROUND
center_hole_shape_styleROUND
end_item_identificationMRAP - M-ATV WITH CS13 POP AND SNE
cross-sectional_shape_styleRECTANGULAR
material_document_and_classificationASTM A568 ASSN STD SINGLE MATERIAL RESPONSE OVERALL
surface_treatment_document_and_classificationASTM B633, TY 2, CL 2 ASSN STD SINGLE TREATMENT RESPONSE OVERALL
NSN5310-01-389-9681
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: 12387279-42 · OEM ⚠ VERIFY BEFORE ORDERING Grade matters for torque spec — don't mix grades. A Grade 5 nut on a Grade 8 bolt weakens the joint. Lock nuts, wing nuts, and castle nuts are NOT interchangeable with standard hex ✓ BROKER TIP Match nut to bolt thread class and material. Stainless bolt + zinc nut = galvanic corrosion. Always verify finish matches (plain, zinc, hot-dip galvanized) PARTSTABLE TECHNICAL DRAWING — NOT TO SCALE
KEY FEATURES
•
SURFACE TREATMENT DOCUMENT AND CLASSIFICATION: ASTM B633, TY 2, CL 2 ASSN STD SINGLE TREATMENT RESPONSE OVERALL
•
OVERALL DIAMETER: 0.495 INCHES MINIMUM AND 0.515 INCHES MAXIMUM IN
•
MATERIAL DOCUMENT AND CLASSIFICATION: ASTM A568 ASSN STD SINGLE MATERIAL RESPONSE OVERALL
•
CROSS-SECTIONAL SHAPE STYLE: RECTANGULAR
•
SURFACE TREATMENT: ZINC AND CHROMATE OVERALL
•
PERIPHERAL SHAPE STYLE: ROUND
•
MATERIAL: STEEL COMP 1008 OR STEEL COMP 1009 OR STEEL COMP 1010 OR STEEL COMP 1012 OR STEEL COMP 1015 OR STEEL COMP 1016 OR STEEL COMP 1017 OR STEEL COMP 1018 OR STEEL COMP 1019 OR STEEL COMP 1020 OVERALL
TECHNICAL CHARACTERISTICS
SURFACE TREATMENT DOCUMENT AND CLASSIFICATIONASTM B633, TY 2, CL 2 ASSN STD SINGLE TREATMENT RESPONSE OVERALL
OVERALL DIAMETER0.495 INCHES MINIMUM AND 0.515 INCHES MAXIMUM IN
MATERIAL DOCUMENT AND CLASSIFICATIONASTM A568 ASSN STD SINGLE MATERIAL RESPONSE OVERALL
CROSS-SECTIONAL SHAPE STYLERECTANGULAR
SURFACE TREATMENTZINC AND CHROMATE OVERALL
PERIPHERAL SHAPE STYLEROUND
END ITEM IDENTIFICATIONMRAP - M-ATV WITH CS13 POP AND SNE
MATERIALSTEEL COMP 1008 OR STEEL COMP 1009 OR STEEL COMP 1010 OR STEEL COMP 1012 OR STEEL COMP 1015 OR STEEL COMP 1016 OR STEEL COMP 1017 OR STEEL COMP 1018 OR STEEL COMP 1019 OR STEEL COMP 1020 OVERALL
CENTER HOLE SHAPE STYLEROUND
HOLE DIAMETER0.214 INCHES MINIMUM AND 0.224 INCHES MAXIMUM IN
OTHER ITEMS IN FSC 5310 — Nuts and Washers
Items in the same Federal Supply class. No interchangeability or substitution relationship is implied.
5310-00-000-0040 5310-00-000-0077 5310-00-000-0079 5310-00-000-1146 5310-00-000-3815 5310-00-000-4532 5310-00-000-4540
SUBSTITUTES & CROSS-REFERENCES 1
5310013899681Reference document
Same NSN cross-reference
Reference document — Informative reference only
LIFECYCLE
NSN statusActive· U.S. Government catalog
No demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is 12387279-42?
12387279-42 is a WASHER,FLAT.
What parts can replace 12387279-42?
There is 1 known substitute for 12387279-42: 5310013899681. Substitute compatibility should be verified for your specific system.
What is the NSN for 12387279-42?
12387279-42 is cataloged in the U.S. Government catalog under NSN 5310-01-389-9681. This indicates validated use in U.S. government and defense supply chains.
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✓ PartsTable — the parts reference. Every fact cited to its source.
PartsTable Design LLC · partstable.com
U.S. Government catalog: edition PUBLOGDVD v12.0.0 (OCT 2026), edition date 2026-10-01, retrieved 2026-10-18.
PartsTable commercial catalog: edition Unified commercial catalog snapshot through 2026-09-28, edition date not on file, retrieved 2026-09-28.